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    Correlation of motor nerve conduction velocity and number of innervated muscle fibers
    (TAYLOR & FRANCIS LTD, 2004) Dalkilic, N; Yuruten, B
    Distal and proximal motor (M) responses were recorded from the "Abductor Pollicis Brevis" (APB) muscle by using the collision method,median motor nerve was stimulated at distal (elbow) and proximal (wrist) regions in a concurrent manner. The delay between two stimuli (ISI: Inter-stimulus Interval), beginning at 9 ins, was decreased by 0.1 ins steps, until the proximal potential completely disappeared. Areas of M responses recorded for each ISI were calculated. Because the area difference between two subsequent ISIs is proportional to the number of muscle fibers innervated by the conduction velocity group at that interval, the relative numbers of muscle fibers,for each velocity group were calculated. The results show that the motor nerve conduction velocities belonging to the innervating APB muscle vary between 38 tills and 57 m/s; the conduction velocity of the group innervating the greatest number of muscle nerves was,found to be 55-57 m/s, which comprised 10% of all fibers.
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    Trigeminocervical Reflex in Fibromyalgia Patients
    (W B SAUNDERS CO, 2003) Yuruten, B; Özerbil, Önder Murat
    Objective: To describe the properties of trigeminocervical reflex in normal Subjects and in patients with primary fibromyalgia syndrome (PFS) having neck pain. Design: Prospective testing of trigeminocervical reflex. Setting: University hospital electromyography laboratory in Turkey. Participants: Patients with PFS (n=16) and healthy volunteers (n=20). Interventions: Trigeminocervical reflex is a brainstem reflex that is evoked by stimulating the sensory branches of the trigeminal nerve and can be recorded from the neck muscles. Electric stimulation of the supraorbital nerve evokes a reflex response (C3) and early reflex response (C1). The mean latencies of C1 and C3 of patients with PFS were compared with normal values. Main Outcome Measure: The Cl and C3 latencies of trigeminocervical reflex. Results: In healthy volunteers, C3 latency +/- standard deviation was 54.17+/-6.00ms ipsilaterally and 51.25+/-9.26ms contralaterally. The difference was not significant (P=.26). The C1 latency was 17.46+/-4.89ms. In patients with PFS, C1 latency was 13.83+/-4.48ms and the C3 latency was 62.70+/-18.22ms. The difference was not significant between the patients (P=.08) and healthy volunteers (P=.17). Conclusion: In patients with PFS having neck pain, trigeminocervical connections were not influenced and some other mechanisms may be responsible for pain in these patients.